Oh God, not another species debate! The last time, this conversation got so heated here, you’d have thought someone proposed building a pop-up in a bicycle lane in a historic district next to a bar where families let their kids run around unsupervised at happy hour while playing connect four and not purchasing any drinks.

OP– It was between 1.5 and 2 ft by my estimate. I felt lucky to get my camera in time, but it flew away as I tried to get outside for a closer shot and has not returned. A quick search online made me think it was a broad-winged hawk… https://en.wikipedia.org/wiki/Broad-winged_hawk

Great photo.
Poster bird against the use of rat poison. If this great predator bird does catch a rat, it likely will die if the rat has ingested poison that, btw, is doing very little to control the rat problem in DC.